IteratorHelpers (OpenJ9 JDK 11)

java.lang.Object
- com.ibm.j9ddr.util.IteratorHelpers

public class IteratorHelpers
extends Object

Utility functions for working with iterators

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static interface IteratorHelpers.IteratorFilter<T>
Interface for filtering iterators

Constructor Summary

Constructors
Constructor Description

IteratorHelpers()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static <T> Iterator<T>`	`combineIterators(Iterator<T>... iterators)`	Takes a list of iterators and returns one iterator that iterates over each iterator in turn.
`static <T> Iterator<T>`	`filterIterator(Iterator<T> it, IteratorHelpers.IteratorFilter<T> filter)`	Filters an iterator
`static <T> List<T>`	`toList(Iterator<T> it)`

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- IteratorHelpers
```
public IteratorHelpers()
```

Method Detail

combineIterators
```
public static <T> Iterator<T> combineIterators(Iterator<T>... iterators)
```
Takes a list of iterators and returns one iterator that iterates over each iterator in turn.

toList

public static <T> List<T> toList(Iterator<T> it)

filterIterator
```
public static <T> Iterator<T> filterIterator(Iterator<T> it,
                                             IteratorHelpers.IteratorFilter<T> filter)
```
Filters an iterator

Type Parameters:

T - Generic type of iterator

Parameters:

it - Iterator to be filtered

filter - Filter object to select which objects to be passed through

Returns:

Filtered iterator